Hi Rosemaiden,
you are not kidding us, are you? A woman turned down by her man when she wants to give him a blow-job?
If it's really the case: does you still share "regular intercourse" with one another as you used to?
- If no, than there may be a relationship/psychology issue and Dianne really elaborated well on the possiblities, I suppose (I just love how sensitive women are with respect to what men think/feel. The world would be a better place if men were the same, I guess...). Anyway that's been covered so well I can't add anything there.
- If yes, than (please forgive my openness) there may be a technique issue. Despite common believe a dick can actually be a rather delicate organ. Some men just don't like to be bitten / feel teeth / get too much suction. On the other hand, others just like that and you may be too careful. Squeeze and pull on his balls, use your fingernails and most importantly your imagination as well as your senses.
Maybe setting the scene will do it if you two enjoy a little roleplay. I suppose, most men also like to pleasure their lovers orally so allow him to do that and then return the favor. Your man may like to fondle you while getting a blow job. Let him do it even if it distracts a bit. Visual stimulation and scents are often wonderful turn ons: do a 69 with you on top.
Talking (and trying), in my very limited experience, are the only ways that have some likelihood of success to sexually get what you want.
No matter what, your man should feel blessed!